<?php if ($diff === false): ?>
    <div class="error">Diff is not supported for this file type.</div>
<?php elseif (empty($diff)): ?>
    <div class="error">No changes.</div>
<?php
else: ?>
    <div class="content">
        <pre class="diff"><?php echo $diff; ?></pre>
    </div>
<?php endif; ?>
